How to Prepare Your Car for Winter: A Step-by-Step Maintenance Checklist

Winter driving conditions put extra strain on a vehicle's battery, tires and fluids at the same time that roads become slicker and visibility drops. Automotive and roadside-assistance organizations recommend completing a maintenance check before the first hard freeze rather than after a vehicle fails to start on a cold morning.

Check the battery first

Cold weather reduces a battery's ability to hold a charge, according to CRC Industries, which makes battery condition one of the most common causes of winter breakdowns. CRC recommends having any battery that is more than three years old professionally tested, cleaning corrosion from the terminals with a wire brush, and making sure connections are tight. CRC also notes that frequent short trips can prevent a battery from fully recharging, which is worth avoiding before a cold spell.

Inspect and adjust the tires

Tires are the only part of the vehicle in contact with the road, and cold air causes them to lose pressure. Both AAA and Michelin cite the same rate: tires lose approximately 1 pound per square inch (PSI) for every 10°F drop in temperature. Michelin advises checking pressure at least once a month with a gauge while the tires are cold and following the inflation figure on the driver's door jamb rather than the number printed on the tire sidewall. It also warns that a Tire Pressure Monitoring System (TPMS) warning light should not be relied on alone, since it typically activates only once pressure is already dangerously low.

Tread depth matters just as much as pressure. CRC recommends a minimum tread depth of 6/32 of an inch using the penny test. AAA describes a related "quarter test," in which a quarter is inserted into the tread groove — if the top of Washington's head is fully visible, replacement is advised. Michelin recommends installing dedicated winter tires once daily temperatures consistently fall below 45°F, explaining that winter-tire rubber compounds stay flexible in the cold while summer and all-season compounds harden and lose grip.

Service the fluids

CRC recommends maintaining a 50/50 mix of antifreeze and water in the cooling system for maximum freeze protection, and checking coolant levels before winter arrives. Engine oil should match the viscosity grade recommended for cold temperatures, since oil thickens as it gets colder. Windshield washer fluid should be swapped for a winter-formula product rated to resist freezing in sub-zero temperatures, according to CRC Industries.

Replace wipers and test lights

CRC advises fitting winter-rated wiper blades designed to handle snow and ice buildup, and testing all exterior lights — headlights, taillights and turn signals — along with front and rear defrosters before cold weather sets in. AAA adds that heavy-duty rubber or all-weather floor mats help manage snow, slush and road salt tracked into the cabin.

Pack a winter emergency kit

Both AAA and CRC recommend keeping a kit in the vehicle for cold-weather breakdowns. Recommended contents overlap closely across the two sources.

• A blanket or sleeping bag
• A flashlight with spare batteries
• A first-aid kit
• Jumper cables or a portable battery starter/charger
• Non-perishable snacks and bottled water
• A small shovel; CRC also suggests sand or cat litter for traction and basic tools, gloves and hats

Adjust driving technique for ice and snow

AAA recommends increasing the typical 3–4 second following distance to at least 5–6 seconds on snow or ice, and applying accelerator and brake pressure gently. If a vehicle hits black ice, AAA's guidance is to take the foot off the accelerator, keep the steering wheel straight, and apply firm, steady brake pressure if the vehicle has anti-lock brakes (ABS). For a vehicle stuck in a snowbank, AAA describes a "rocking maneuver" — gently alternating between forward and reverse gears — only after clearing snow from around the tires and confirming the exhaust pipe is not blocked.

Step-by-step pre-winter checklist

1. Test the battery (especially if it is over 3 years old) and clean terminal corrosion.
2. Check tire tread depth using the penny test (CRC recommends a 6/32" minimum) or AAA's quarter test, and inspect for cracks or uneven wear.
3. Check tire pressure against the door-jamb figure and recheck at least monthly, since pressure drops roughly 1 PSI per 10°F.
4. Consider switching to winter tires once daily temperatures fall consistently below 45°F.
5. Check coolant level and antifreeze mix (50/50 antifreeze-to-water), oil viscosity, and brake and power-steering fluid.
6. Fill the washer reservoir with winter-formula fluid rated for sub-freezing temperatures.
7. Fit winter wiper blades and test all lights and defrosters.
8. Pack an emergency kit with a blanket, flashlight, first-aid supplies, jumper cables, snacks, water and a shovel.